Localizing Sound

I have a sound_ambiant entity in a specific room, where I want olny the people in that room to hear it.

No matter what I do, you can hear the sound all over the map. And no, the "play sound entire map" option is not checked. I have changed the "Max Audible distace set at 10. I've tried to from everything 1 to 1200 and you always hear it all over the map.